<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <input type="text" id="ipt">
    <script>
        const oIpt = document.getElementById('ipt');

        //核心代码
        function center(e) {
            console.log("center");
            console.log(e);
            console.log(this);
        }

        oIpt.oninput = debounce(center, 500);

        function debounce(fn, time) {
            let timer = null;
            return function (e) {
                clearTimeout(timer)
                timer = setTimeout(() => {
                    fn.call(this, e)
                }, time)
            }
        }
    </script>
</body>

</html>